It starts with a flicker. Then the lights go out. A few seconds of quiet — and then the questions begin. Is the router still on? Can the kids still get online? And if you’re working from home, the bigger one: how long before someone notices you’ve dropped off every call and platform simultaneously?
Power cuts happen. Storms, municipal faults, tripped breakers — the causes vary, but the result is the same. For most South African households, when the electricity goes, the internet goes with it. And for a household where one or more people work or study from home, that’s not just inconvenient. It can genuinely cost you.
Why Your Internet Dies When the Power Does
Here’s something most people don’t realise: your fibre line itself doesn’t lose power during a blackout — it’s the equipment in your home that does. Your router, and more importantly your ONT (Optical Network Terminal — the small box where the fibre cable enters your home), both need mains electricity to function. When the power goes off, those devices go off, and your internet connection dies with them even though the fibre network outside is still running perfectly.
This means that fibre, despite being technically superior to older connections in almost every way, has a specific vulnerability: it’s entirely dependent on powered equipment at the home end. A power cut of any length — even ten minutes — takes your connectivity down completely.
What LTE Failover Does for a Home
LTE failover is a backup internet solution that switches your home network to mobile data when your primary connection drops. The key word is automatic — it doesn’t require you to notice, find your phone, or switch anything manually. It just happens.
The way it works: a router with failover capability constantly monitors the health of your primary connection. The moment it detects a failure — whether from a power cut, a line fault, or an ISP outage — it switches to a secondary LTE connection within seconds. Your devices stay connected. Your work call keeps running. Your kids’ lessons continue. Nobody notices anything except that the internet didn’t die when the lights did.
When power returns and your primary connection comes back up, the router switches back automatically. The LTE connection was only ever a backup — you’re not paying for it to run all day, and you’re not using meaningful data during normal operation.
What It Actually Costs vs What It Actually Saves
The hesitation most households have about LTE failover comes down to cost. But the maths usually lands in favour of setting it up.
A basic LTE failover setup consists of a capable router — something like a Ubiquiti EdgeRouter or a dual-WAN capable device — and a dedicated SIM card on a capped data plan that you barely touch under normal circumstances. The ongoing cost is modest because you’re not using the LTE as a primary connection. You’re using it for the handful of hours per month when your main line fails.
Now consider what a few hours of unexpected downtime actually costs a work-from-home household. A missed deadline. A dropped client call. An exam that couldn’t be submitted on time. A remote work session that simply doesn’t happen. For most households with even one remote worker or student, the cost of a single bad outage exceeds the monthly cost of having failover in place.
The March 2024 Subsea Cable Outage
If you need a concrete reminder of why internet redundancy matters, consider what happened in March 2024. Multiple subsea cables on both the West and East Coasts of Africa were damaged simultaneously, affecting internet connectivity across South Africa and much of the continent. The cables affected included WACS, MainOne, SAT3, ACE on the West Coast, and SEACOM and others on the East Coast. The combined impact caused significant slowdowns and outages for South African users that lasted for hours — in some cases, longer.
This was not a local fault. It could not be fixed by rebooting a router. It was an infrastructure event that affected ISPs across the country. Households and businesses with a secondary LTE connection on a mobile network — which operates on entirely different infrastructure from fibre — stayed online. Those without one simply went dark and waited.
That’s the case for redundancy in a single real-world example.
Is LTE Failover Right for Your Home?
Not every household needs it. If your internet goes down occasionally and the impact is limited to mild frustration, a failover setup may be overkill. But if any of the following apply to you, it’s worth considering seriously:
One or more people in your household work from home. Anyone is studying remotely or submitting work online. You run a small business from home. Your area has a history of unreliable power or fibre outages.
For these households, having a backup connection isn’t a luxury. It’s the same kind of thinking that keeps a torch in the kitchen drawer — you probably won’t need it tonight, but when you do, you’ll be very glad it’s there.
Dial a Nerd installs LTE failover solutions for South African homes — configured to switch automatically, without any input from you. If your internet reliability matters, we can help you protect it.
